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      9、UmbracoNewsSite：分页
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	Posted on <a href="/2016/01/09/Umbraco-Getting-Started-9/" class="article-date">
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        <p>　　接着上一篇博客的内容，这一篇我们开始给新闻列表进行分页。</p>
<p>　　首先说一下分页的思路，由于Umbraco使用的是模板的结构，所以我们需要将分页的页码数发送到当前的页面中，然后拿到这个页码数，对应的进行读取对应页码的新闻。<br>　　首先给当前的新闻分类添加了10条新闻，然后按照每页显示3条来进行分页。<a id="more"></a><br><img src="/image/umbraco/backoffice54.png" alt=""></p>
<p>　　现在需要对<strong>News List</strong>模板中的代码进行编写，重新编写的代码如下：<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br></pre></td><td class="code"><pre><span class="line">@inherits Umbraco.Web.Mvc.UmbracoTemplatePage</span><br><span class="line">@&#123;</span><br><span class="line">    Layout = <span class="string">"Master.cshtml"</span>;</span><br><span class="line">    int count = CurrentPage.Children.Count();  <span class="comment">//拿到当前新闻分类的新闻总数</span></span><br><span class="line">    int pageCount = <span class="number">1</span>;   <span class="comment">//默认的页码为1</span></span><br><span class="line">    int currentPageIndex = <span class="number">1</span>;  <span class="comment">//默认当前为第一页</span></span><br><span class="line">    <span class="keyword">if</span> (count % <span class="number">3</span> &lt;= <span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        pageCount = count / <span class="number">3</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">else</span></span><br><span class="line">    &#123;</span><br><span class="line">        pageCount = (count / <span class="number">3</span>) + <span class="number">1</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (!int.TryParse(HttpContext.Current.Request.QueryString[<span class="string">"Page"</span>], out currentPageIndex))</span><br><span class="line">    &#123;</span><br><span class="line">        currentPageIndex = <span class="number">1</span>;<span class="comment">//第一次进入页面的时候，还没有传递“page”，需要让currentPageIndex等于1(第一页)</span></span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">var</span> newsLists = Model.Content.Children().OrderByDescending(<span class="function"><span class="params">o</span> =&gt;</span> o.CreateDate).Skip((currentPageIndex - <span class="number">1</span>) * <span class="number">3</span>).Take(<span class="number">3</span>); <span class="comment">//按照新闻创建时间倒序排列</span></span><br><span class="line">&#125;</span><br><span class="line">&lt;div <span class="class"><span class="keyword">class</span></span>=<span class="string">"container"</span>&gt;</span><br><span class="line">    &lt;div <span class="class"><span class="keyword">class</span></span>=<span class="string">"row"</span>&gt;</span><br><span class="line">        @foreach (<span class="keyword">var</span> post <span class="keyword">in</span> newsLists)</span><br><span class="line">        &#123;</span><br><span class="line">            &lt;div <span class="class"><span class="keyword">class</span></span>=<span class="string">"row"</span> style=<span class="string">"margin-top:10px"</span>&gt;</span><br><span class="line">                &lt;a href=<span class="string">"@post.Url"</span>&gt;</span><br><span class="line">                    &lt;div <span class="class"><span class="keyword">class</span></span>=<span class="string">"col-lg-4 col-sm-6"</span>&gt;</span><br><span class="line">                        &lt;img src=<span class="string">"@post.GetCropUrl("</span>newsImage<span class="string">", "</span>newsImage<span class="string">")"</span> <span class="class"><span class="keyword">class</span></span>=<span class="string">"img-responsive img-thumbnail"</span> /&gt;</span><br><span class="line">                    &lt;<span class="regexp">/div&gt;</span></span><br><span class="line"><span class="regexp">                    &lt;div class="col-lg-8 col-sm-6" style="color:#000000"&gt;</span></span><br><span class="line"><span class="regexp">                        &lt;h4 style="font-family:'Microsoft YaHei'"&gt;@post.GetPropertyValue("title")&lt;/</span>h4&gt;<span class="xml"><span class="tag">&lt;<span class="name">b</span>&gt;</span>@post.CreateDate.ToLongDateString()<span class="tag">&lt;/<span class="name">b</span>&gt;</span></span></span><br><span class="line">                        &lt;p&gt;@Umbraco.Truncate((post.GetPropertyValue(<span class="string">"introduction"</span>)).ToString(),<span class="number">100</span>,<span class="literal">true</span>)&lt;<span class="regexp">/p&gt;</span></span><br><span class="line"><span class="regexp">                    &lt;/</span>div&gt;</span><br><span class="line">                &lt;<span class="regexp">/a&gt;</span></span><br><span class="line"><span class="regexp">            &lt;/</span>div&gt;</span><br><span class="line">            &lt;hr /&gt;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        &lt;nav&gt;</span><br><span class="line">            &lt;ul <span class="class"><span class="keyword">class</span></span>=<span class="string">"pagination pagination-lg"</span>&gt;</span><br><span class="line">                &lt;li&gt;</span><br><span class="line">                    &lt;a href=<span class="string">"?page=@(currentPageIndex-1&lt;1?1:currentPageIndex-1)"</span> aria-label=<span class="string">"上一页"</span>&gt;</span><br><span class="line">                        上一页</span><br><span class="line">                    &lt;<span class="regexp">/a&gt;</span></span><br><span class="line"><span class="regexp">                &lt;/</span>li&gt;</span><br><span class="line">                @<span class="keyword">for</span> (int i = <span class="number">1</span>; i &lt;= pageCount; i++)</span><br><span class="line">                &#123;</span><br><span class="line">                    &lt;li <span class="class"><span class="keyword">class</span></span>=<span class="string">"@(currentPageIndex==i?"</span>active<span class="string">":"</span><span class="string">")"</span>&gt;<span class="xml"><span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">"?page=@i"</span>&gt;</span>@i<span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><span class="xml"><span class="tag">&lt;/<span class="name">li</span>&gt;</span></span></span><br><span class="line">                &#125;</span><br><span class="line">                &lt;li&gt;</span><br><span class="line">                    &lt;a href=<span class="string">"?page=@(currentPageIndex+1&gt;=pageCount?pageCount:currentPageIndex+1)"</span> aria-label=<span class="string">"下一页"</span>&gt;</span><br><span class="line">                        下一页</span><br><span class="line">                    &lt;<span class="regexp">/a&gt;</span></span><br><span class="line"><span class="regexp">                &lt;/</span>li&gt;</span><br><span class="line">            &lt;<span class="regexp">/ul&gt;</span></span><br><span class="line"><span class="regexp">        &lt;/</span>nav&gt;</span><br><span class="line"></span><br><span class="line">    &lt;<span class="regexp">/div&gt;</span></span><br><span class="line"><span class="regexp">&lt;/</span>div&gt;</span><br></pre></td></tr></table></figure></p>
<p>　　分页后的效果如下：</p>
<p>默认进入新闻分类时，应该显示第一页的数据：<br><img src="/image/umbraco/backoffice55.png" alt=""><br>点击按钮<strong>2</strong>时：<br><img src="/image/umbraco/backoffice56.png" alt=""><br>点击按钮<strong>1</strong>时和刚进入页面时的地址是不同的，注意这一点：<br><img src="/image/umbraco/backoffice57.png" alt=""></p>
<p>　　下一篇，我们继续创建在首页显示新闻聚合页面，将几个板块新闻中的最新的新闻显示出来。</p>

      
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